Reel drive control for grinder machines



July 22, 1947. L; ILLMR l REEL DRIVE QONTROL FOR GRINDER MACHINES "FiledJuly 25, 1943 s jshesfsheet 1 July 22, 1947. L. ILLMER l REEL DRIVECONTROL FOR GRINDER M AGHINES Filed July 25, 1945 3 Sheets-Sheet 2Summer'.

July .22, 1947. L. ILLMER REEL DRIVE CONTROL FOR GRINDER MACHINES 3Sheets-Sheet 3 Filed July 25, 1945 Snventor Patented July 22, 1947 REELDRIVE CONTROL FOR GRINDER MACHINES Louis Illmer, Cortland, N. Y.Application July 23, 1943, Serial No. 495,948

Claims.

This invention relates to surface grinder machinery in which abrasivetape or an equivalent cutting agency may be eiiectively utilized, andmore particularly pertains to improved interchangeable reel driveequipment of the reversible type by which a long batch of round or flatreelable stock may be dragged longitudinally at high velocity insuccessively reversed passes into operative engagement with a pluralityof slowly fed abrasive elements carried by either stationary or rotatinghead means.

The present high duty apparatus may be installed at moderate first costand is especially adapted to rapidly and economically rough grind areloadable batch of larger gauged hard alloy steel or the like hightensile stock on a low labor servicing basis, preferably withoutrequiring any fast moving working parts except for the treated stockitself.

The instant grinder improvements are primarily directed to the use of apair of conjointly driven reels of relatively large diametral size ofwhich one such may be demountably coupled to a sectionalized drive axlewhereby to expedite batch replacement and maintain a high productivemachine output as measured over a protracted operating period. Each suchreel is further equipped with controlled dual drive clutch means,preferably of the electromagnetic type, which are alternately renderedinactive to successively reverse the travel direction of a treatedbatch. Also associated with said reels are long-range motorizedcross-shaft means and other structural refinements serving to promotethe end in view.

The object of my invention is to devise an cicient and compact workpiece drag system of the indicated reversible reel type capable ofeffectively processing a long batch of stock when successively passedlongitudinally through grinder head means to complete its abrasivetreatment at a relatively fast productive rate and which system requiresa comparatively short shut down period between batch runs in which tooperatively install a next succeeding batch of stock for similartreatment.

Reference is had to the accompanying three sheets of drawings which areillustrative of a preferred exempliiication, and in which drawings:

Fig. l represents in approximate scale, a plan layout oi my controlledreel assembly, and Fig. 2 is an elevational side view thereof.

Fig. 3 shows a gear driven fore-end region of a reel axle taken along3-3 of Fig. 1, and Fig. 4

a detail of such gear transmission taken along the broken line 4--4 ofFig. 3.

Figure 5 details a split aft axle end region together with an interposednut coupling for my demountable reel.

Fig. 5A is a sectional detail taken along SA-EA of Fig. 5 to showabutting axle parting faces that may be relatively shifted in a definitetransverse direction without material face separation.

Fig. 6 is cross-sectionally taken along B--G of Fig. 5 to reveal apreferred ratchet mechanism for a rapid loosening or securement of thecoupling nut, and Fig. 'l depicts a top view thereof.

As arranged in Fig. 1 for the treatment of wire stock, my system maycomprise a pair of anged reels In and II that are respectively mountedupon the mated driven parallel axles I2 and I3. These axles may each besuspended between a fore main bearing pedestal I4 and an aft bearing I5.The respective overhanging fore bearing axle ends may each be separatelydriven by a compactly encased transmission unit I1 (see Figs. 3 and 4).Each such unit may be provided with a bevel gear or the like skew meansI8 of which its sleevelike hub may be coaxially and rotatably disposedabout its axle as shown. The aft end of such gear hub may have a sleevepinion I9 affixed thereto. Mes-hing with this single pinion aremulti-ple gears such as 20 respectively carried upon a separate compoundspindle 2l. Each spindle may bridge the opposed end walls 22 and 23 ofthe split stationary casing utilized in unit I'l and which walls arealignedly apertured to allow of freely projecting the fore axle endtherethrough. Conjointly mounted upon each such spindle is a pinion 24'that interlockingly rotates in unison with its mated gear 20. Thesemultiple pinions mesh with a common keyed axle drive gear 25 andcollectively provide for an ample combined reduction ratio between thehigh speed unidirectional main motor 26 and either of the slowly rotatedreel axles I2 and I3. Each such speed reducer is purposely designed tounstallingly operate in reverse.

In accordance with the Fig. 1 assembly, the respective bevel gears I8 ofthese axles may be selectively coupled to the main drive motor 26through the cross-shaft `2'I mounted between the auxiliary bearings 28and 29. The overall length of such cross-shaft is herein kept shorterthan the interspacing between the axles I2 and I3 and lies inparallelism with the suspended work piece length that tangentiallyinterconnects my reels Ill and II. A shaft drive pulley 3i! locatedbetween said bearings may be belted to the unidirectional main motor 26to rotate said shaft at a considerably faster speed than the axles I2 orI3.

Separate electromagnetic clutches SI and 32 may respectively beinterposed between each such auxiliary bearing and its contiguous loosebevel gear in the Fig. 4 manner to independently command the driving ofits associated axle. Each such clutch may comprise a faced annular slipdisc or releasable grip elements 33 that encircle the cross-shaft 21,also a switch controlled eld coil 34 that may be energized from anysuitable current source through the commutator rings 35 and lead wiressuch as 35. As indicated by a'rrows, the Fig. 1 installation is suchthat the reel axles may be selectively motor driven in opposeddirections whenever one or the other 'of said clutches is madeoperative. The eld coil "current flow may be so controlled that only onemagnetic clutch is'allowed to become active at any given time andpurposely leave the other clutch idle. Both reels will then run in` alike direction because of being interconnected by the work piece and thereleased slip disc 33 of such uncoupled clutch will then be freelyrotated by its associated reducing gear I1. Y

As detailed in Fig. 5, a transversely split axle I2 may comprise a foreor master section of which the aft end region is encircled by anoutstanding endless flange 31, the flange hub being aixed in place toprovide for an annular thrust face 39 and separable axle parting faces39 that whenY uncoupled, are rendered relatively shiftable in atransverse direction, that is to say lengthwise of the radially disposedkey 44 without requiring a substantial separation of the faces 39 (seeFig. 5A). A substitutional tandem aft axle section may be Vequipped witha perimetricallythreaded flange 4I that overhangingly abuts said ilatparting face 39 to constitute an aligned sectionalizedfaxle. Said flangethreads cooperate withY 'a demounta-ble lscrew coupling agency 43 thatrenders interchangeable my reel lil, Said aft Yaxle section may lfurtherinclude la tubular shank component 43 that is preferably tightlytelescoped as a plug and keyed atv 45 Awithin a standardized bore of thereelhub 6 to project rearwardly beyond the y-partingface 39 and connesof the `axlesupport lbearing I5. An axle web vcomponent 42 may s-pan the`flange 4I as shown. It willbe obvious thatas'a demountable reelupholding agency, such substitutional -aft axle-section may also beincorporated integrally with the reel hub. Y

The interiorlyshoulderednut 43 when screwed up into operative position,brings-thenut Yshoulder into tight clamping engagement with the thrustface 38. A straight-edged, radially disposed supplementary key 44*having la vlenga-th shorter than the thread bore of the nut 4'3, may beinterlockingly interposed `between `the abutting parting faces 39 toprevent relative rotation therebetween while said key remain slidablyentered within the web 42 bythe semidepthrange designa-tedlI-I. Suchunitarycoupling means may be speedily connected by screwing up a singleaxially centralized nut or the likefa-ceclamping agency. The releasednut 43 maybe retracted to theex-tent mar-kedG, whereupon-the demountablereel I'9 may be unobstructedly lifteddirectly upward when lthe `key 44stands vertically without requiring 'a material separation between thema-ted substantially -vplaniform parting --faces 39. A spacedstop-collar 4'6maybe applied tov-the forward hub end of the axle flange31 and the lil 4 contiguous face of the nut 43 may be provided with astop pin 41. As dened by dotted and dashed outline in Fig. 5, a splitcollar 48 may be entered between said stop pin and the collar 41 toblock the assembled nut from inadvertently backing off in eitherdirection of reel rotation.

In Fig. 2 there is schematically indicated a retractably mounted arcuatesaddle 49 disposed beneath the perimeter of the demountable reel I0 andserving as a cradle that facilitates the hub centering of a substitutespare reel when likewise coupled in the Fig. 5 manner. One end of suchsaddle may be pivotally mounted at 50 and the other end actuated by rammeans 52 whereby to bodily raise or lower such interchangeable reel intoplace. In addition, the hook of a traveling chain hoist 53 may beemployed to remoVe a completed batch together with its detachable reel,or to transfer into place a substitute reel initially having an ungroundstrand batch prereeled therearound.

The smoothly turned rim component 55 of each reel is preferably kept toa common large diametral size to obviate undue bending stress whenlaying a relatively heavy gauged work piece 54 thereon. 'Said rim may beintegrally interconnected to its hub 53 by plural reel arms 51. All mydemountable reels may be permanently tted upon a standardized hub plugcomponent 49. The several batch layers may herein be held to acontinuous length of about one ton or more in weight and thereby alfordan adequate time period between next successive reel reversals.

Because of the relatively large reel diameters required for treated workpieces of larger gauge, it is preferred to locate their horizontallyparallel axles I2 and I3 in a servicing pit below the level of a beamsupported oor 5I and have both companion reels I!) and II extendupwardly through said oor in the Fig. 2 manner and tangentially suspendthe work piece horizontally between the top regions oi both reels asshown. It will be observed that the non-demountable solid reel axle I3may be kept devoid of any coupling means, its aft 'end in this instancemay merely project beyond its bearing I 5 and be enlarged to astandardized hub bore size by a cylindrical bushing 59 (see Fig. l). Asregards the coupled reel I8, it is the intent to provide forinterchangeable spare units and to utilize such substitute reels forprereeling an unground batch of wire thereon by extraneous means forsubsequent coupled installation onto the master section of the axle I2.When completely processed, the nished batch may be restored upon itsoriginal reel I0 prior to its batch removal.

Each initial layer of such prereeled batch may include a repeatedly usedlead end section welded to a terminal of the treated batch proper andhaving a free lead end affixed to its reel perimeter. Such renementinsures that the entire interposed batch may be uniformly ground at highvelocity irrespective of slowing down during reversing periods. Whenoperatively coupled in place, the outer prereclcd batch terminal of thereel I 0 is intended to be spliced to the free lead end section of thecompanion reel I I so that when one of the magnetic clutches such as 32is thrown into commission, the other idling clutch 3| will allow itsaxle IS to be dragged in a corresponding direction by 'a suspendedportionof the reel interconnecting strand 5'4.

Referring in detail to-Figs. 6 and '1, these disclose 'a preferred rapidmode for securely tightening up the unitary coupling nut 43 by the useagie-4,465

of* auxiliary motorizedmeans rather than by manually opera-tedV wrenchmeans. A- pai'r ot upstandingrocker arms Si` and B2= mayA be pivotedabout each sidei ofv the reel axle ll2- with their swinging endsinterconnected bythe tie rod 63. This rod and its associated parts-arelaterally offset out of registry with the key 44 to-clear the hub of thereellil when raisedl vertically. A medial portion of said rod is shownprovided with a pivoted nut pawl 64 adapted to releasably engage anendless series of ratchet teeth 65?' that circumscribe thenut axis. Saidpawl may be resiliently reta-ined: by balanced springs such as 56 andthe pawl selectively urged' into operative engagement with said teeth asindicated in full outline: This shiftable pa-wlmay also be snappedthrough the angle T into a dotted neutral posi*- tion andmanual-lythrown onward into its reversedv position. For normal reel runningconditions; said pawlisplacedin such cleared position. A gearedv motor6l'I m-ay have its slow speed outletshaft equipped with a crank 69 whichby the adjustable feed rod Et' serves to propel the bell crank ratchet61 in toggle fashion whereby to forcibly actuate the coupling nut 43 ineither direction. As an equivalent; a reversible motor may be directlygeared to impart a slow continuousmovement rather thanintermittentratchet movementsV to said nut.

Furthermore in lieu of the cited Fig. 5 split collar 48, Fig. 6v resortsto an automatic safety or emergencyi tell-tale device comprising anabutment lug 'ID- whichy may be floatingly interposed between the stopcollar 4G and the opposed pin 41- to normally clear the latter whilethereel I0 iskept in rotation. Said lug may be shiftably carried by thestationary pivot 'i'l and provided with a depending twin profile cam l2that is spring urged into a centralized position with respect totheroller switch arm '53; A double push button snap switch 14 may therebybe automatically thrown into its cut off position should the nut 43accidentally start to back off in either direction of reel rotation andallow the stop pin Il` to collide with the lug 10. The switch lead wiressuch as 15 may be series connected to command current flow through oneof the electromagnetic clutches to bring the reeli'ng system to restslinulkil 'the Vreel nutbe'clome yloosened While in service;- L

Figs; ands 2 schematically show a level winder mechanism especiallysuitedltot present large reel needsas-appliedto'- wird treatment. Theaxles t2! and f3'- may respectivelybfc-providedI with an aiii-xie'dsprocket 1B that chain drilves its sprocket pinionill. Each such drivenpinion maybe separately carri-'ed upon the high speed input shaft of a`sing-leJ worm gear reduction box v'l8- erected ab'ovethe-iioor levelEliVasv shown. rIfhe box out- .putshaft; may be provided with a changegear hatmesh'es with.'- amatedigear parallelly mounteduponf an auxiliarystub shaft The" last named shaft-may alsofcoaxial-lymount a 'crank pinldisc 832 thatl reciprocatively actua-tes the roller link 84 to rock'thelevel winder arm 8l. Said' disc and its chang-e1l gearm-ay beinterlockedtorotate innuniscnr- 'the installation'being such tlia'tltheselective-'usciofsubstitutechange gear pairsread ily permits? ofmodifyingtheL rlate: of crank pin ro'ta-tior-ix with respect-to' itsaxle sprocket 16;

regardsfmypreferred grinder apparatus', this "may cornprisefaj tubular;axiallysplit housing; il# adapted tov abrasively treat the suspended4worlcpiece554 ,when centrally passiedvtherethr 011th-,

order tri-"provide for the compact grinder' as- 6 sembly shownin Fig 2,suchsuspended.- work piece length isv purposely arranged. parallelismwith the cross-shaft 21.

Such single housing may be provided with mul-A tiple tapes of suiiicientcollective width to combinedly grip the perimeter of a treated workpiece having a circular profile up to its safe drag load capacity. Eachsuch tape may be independently impressed into engagement with said Workpiece by suitable backing jaw means, preferably of a releasable type.

The functionalbehavior of my reel drive system is thought obvious fromthe foregoing description of its elements. As Will be understood, therespective lead wires 36 commandingthe magnetic clutches 3 l` and 32 maybe separately placed under the positive control of manual or automaticswitch means. Assuming tha-tademountable spare reel it with a prereeledunground batch to have been operatively installed in place' upon itsmaster axle section and the couplingnut ll3to have been adequatelytightened by the Fig. 6 instrumentalities, then by initially energizingthe motor driven clutch 32', the Fig, 1` assembly is ready to transfersuch prereeled batch through the grinder housing 9i and on to thepreviously emptied reel il at a iinally attained uniform pass velocity.Such velocityv is preferably held at a predetermined travel rate ofseveral thousand feet per minute between reversal periods.

When the trailing end' region ofz said transferred batch is reached',the clutch 3-2 is disengaged, which slows up said strand interconnectedreels. The considerable abrasive drag imposed upon the treated strandeffects a fairly rapid' deceleration of the rotating reels. Uponapproach to rest, the other clutch 315 may be manually or automaticallyenergized in sequencev by switch means to-reliabls7 reverse the loadedreels lil-and ll' irrespective of their axle spacing.

If preferred, all of the tape backing jaws may be released during eachstarting periodl to' promote rapid reel acceleration. The initial leadwire affixed to either batch end is intended to be sufliciently long toafford an appropriate number of rim turns for present needs and therebyassure that the entire active batch may be evenly processed throughoutits length. The use of batch lots approximating one ton in weight,materially extends the time period between reel reversals andcorrespondingly reduces the frequency of clutch switching. Suchinfrequent reversal practice obviates overheating of thev main drivemotor and provides adequate time in which to air cool the coiled workpiece between successive passes.

The required-number of repeat passes depends among otherlconsiderations, upon the hardness of the treated material, thecollective Width of the abrasive tapes, the rate of tape feedv and theextent to which an initial work piece size needs to be reduced. Uponhaving reached a prescribed requirement with the completed batch rewoundupon its original reel It, the main motor 26 may be shut down, whereuponmy centralized hub nut 43 may be unscrewed by the auxiliary motor El andthe batch removed for subsequent bundling or the like. Aninterchangeable spare reel may then be substituted and the same abrasivepro'- cedure continued on such renewed batch. As a consequence of myunitary single axle coupling and to the end that a low cost per poundofprocessed product may be obtained, such spare reels may be installedwith dispatch kand the net' grinding rate kept to a high level ofeffective produc'- tive output at the minimum servicing labor andwithout having to unduly interrupt active performance while reloadingthe reels of my grinder machine.

While my unidirectional motor 26 remains in operation, it is renderedresponsive to a clutch shift without having to wait during each reelreversal for such drive to attain its full rated speed. Furthermore bylocating my heavy duty clutches 3| and 32 upon the low torquecross-shaft 21, the clutch size and cost may be materially lowered incomparison to equivalent clutches installed directly into the hightorque axles l2 and i3.

The foregoing disclosures will, it is believed, make evident to thoseskilled in this art, the outstanding commercial advantages afforded bymy refined heavy duty reeling system. It will be evident that certainstructural aspects of the disclosed reeling and housing improvements mayreadily be modied to produce a like result, all without departing fromthe spirit and scope of my invention, heretofore described and moreparticularly characterized in the appended claims. I

1. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive batches of reelable stock, a:pair of horizontal axles of which one axle is transverselysectionalized intermediate its ends by abutting parting faces of whichone such has a straight-edged keyway sunk therein and the other face isprovided with a registering projection adapted to seat between saidedges to comprise a master section arranged to have one of severalsubstitute sections interchangeably coupled thereto in axial tandemalignment with said master section and which substitute sectionsrespectively uphold thereon the hub of a stock carrying reel toconstitute a bodily demountable spare unit, the other of said pair ofaxles being provided with a driven companion reel serving to transferthereon the stock carried by any one of such interchangeably installedunits and coupling means drawing said parting faces toward each other.

2. In a reeling system for expediting the re-i loading of a grinder`machine adapted to abrasively treat successive batches of reelablestock, a pair of substantially parallel axles ci which one axlecomprises separable tandem sections re-l spectively having abutting endsthat are rendered relatively shiitable in a definite transversedirection without requiring substantial axial separa-tion of said endswith one such section rotatably supported and its mated sectionoverhangingly disposed in axial alignment therewith, centralized unitarycoupling means demountably interlocking the abutting ends of saidsection against shift in the aforesaid direction, a stock carrying reelupheld by said mated section, a companion reel mounted on the other ofsaid pair of axles, and drive means serving to rotate said reels inunison with a stock portio-n spanning the respective reel perimeters.

3. In a reeling system for expediting the rcloading of a grinder machineadapted te abrasively treat a batch of reelable stock in reversedpasses, a pair of axles of which one axle comprises separa-ble tandemsections, means for rotatably supporting one such section and foroverhangingly coupling the mated tandem seo-- tion in axial alignmentwith said one section, said coupling means including threaded solitarynut means arranged to demountably interlock contiguous ends of saidtandem sections, a stock carrying reel upheld by said coupled matedsection, a companion reel cooperatively mounted on the other of saidpair of axles and having a stock portion transferably suspended betweenthe relspective reel perimeters, and drive means for reversing saidreels in unison.

4. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive batches of reelable stock, a pairof substantially parallel axles of which one axle comprises separabletandem sections whose contiguous ends are respectively provided withopposed cylindrical flanges having abutting parting faces, one suchflange being provided with a perimetrically inset annular thrust facethat is laterally spaced from its parting face and the perimeter of theother flange being threaded, a tubular coupling nut sized to cooperatewith such flange thread and one end region of which nut has aninternally disposed shoulder that engages said thrust face when thecoupling nut is drawn up into operative position, supplementaryretaining means interlocking the respective parting faces againstrelative rotation, a stock carrying reel upheld by one such coupled axlesection, a Companion reel mounted on the other of said pair of axles,and means rotating said reels in unison.

5. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive batches of reelable stock, a pairof parallel axles of which one such axle is transversely sectionizedbetween lts ends to comprise separable tandem sections respectivelyhaving abutting parting faces, means for rotatably supporting one suchsection and for demountably coupling its mated tandem section thereto inaxial alignment, supplementary straight-edged key means diametricallyinterposed across said parting faces to interlock the coupled facesagainst relative rotation and which faces when uncoupled are relativelyshiftable lengthwise of said key edges, a reel upheld by said coupledmated section, a companion reel mounted upon the other of said pair ofaxles, and drive means cooperatively rotating said reels in unisonthrough said coupled axle sections.

6. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive batches of reelable stock, a pairof parallel axles of which one axle comprises separable tandem sections,means for rotatably supporting one such axle section, coupling means ofthe threaded nut type which when screwed up into operative positionserve to retain the mated tandem section in overhanging axial alignmentwith said one section, nut locking means arranged to obstruct the nutfrom retracting out of its operative position, a stock carrying reelupheld by said coupled tandem section, a companion reel mounted upon theother of said pair of axles, and means rotating said reels in unisonwith a stock portion transferably suspended between the the respectivereel perimeters.

7. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive batches of reelable stock, a pairof parallel axles of which one axle comprises separable tandem sections,means rotatably supporting one such axle section, threaded couplingmeans provided with ratchet teeth and which means when brought intooperative position serves to tightly ax the mated tandem section inaxial alignment with said one section, driven retractable pawl meansarranged when active to engage said ratchet teeth and thereby draw upthe coupling means into said operative position, a stock carrying reelupheld by said coupled tandem section, a companion reel ycarried by theother of said pair of axles, and means rotating said reels in unisonwith a stock portion transferably suspended between the respective reelperimeters.

8. In a reeling system for expediting the reloading of a grinder machineadapted to abrasively treat successive .batches of reelable stock, arpair of parallel axles of which one axle comprises separable tandemsections, means for rotatably supporting one such section, threadedsolitary nut means serving to demountab-ly couple contiguous ends ofsaid tandem sections in axial alignment, said nut being provided with aseries of ratchet teeth that encircle the nut axis, reciprocativelyguided pawl means arranged to be selectively shifted into reversedengagement with said teeth, actuating means for forcibly reciprocatingthe guided pawl means in either travel direction, a companion reelcarried by the other of said 'pair of axles, and drive means rotatingsaid reels in unison with a stock portion transierably suspended betweenthe respective reel lperimeters.

9. In a reeling system for expediting the reloading o a grinder machineadapted to abrasively treat successive batches of reelable stock, a pairof parallel axles of which one axle conrprises separable tandemsections, means for rotatably supporting one such axle section, threadedcoupling means which when tightly screwed into operative position serveto interlookingly aix the mated tandem sections in overhanging axialalignmgent with said one section, a stock carrying reel upheld by saidoverhanging coupled section, a companion reel mounted upon the other ofsaid pair of axles, means rotating said reels in unison, and anemergency device including tell-tale means arranged while in service toautomatically register an accidental recession of said coupling meansfrom operative into a loosened condition.

10. A reeling system adapted to abrasively treat successive batches ofreelable stock and comprising mated high-torque axles that are widelyspaced apart in substantial horizontal vparallelism and are respectivelydisposed to bridge a separate pair of axle mounting main bearingpedestals with an end rportion of one such axle overhanging the pedestalnext adjacent thereto, a stock carrying reel affixed to such overhangingaxle end and a companion reel affixed to the other axle adapted to havea reelable stock length alignedly suspended to tangentially span therespective top regions of the reel perimeters, a low-torque .crossshaftof an overall length shorter than the aforesaid long range axle spacingand disposed to lie axially coincident with the `plane of said parallelaxles with the respective shaft terminal regions directly interconnectedto an adjoining -axle by skew gear reducing means including a bevel gearcarried by each such cross-shaft terminal region and which shaft isrotatably upheld by a pair of auxiliary pedestals respectively locatedcontiguous to one such Ibevel gear, selectively controllable matedclutch mechanisms each including a pair of opposed definitely shiftablegrip elements operatively installed and retained in close proximity upona shaft terminal region between one such bevel gear and its nextadjacent auxiliary pedestal, and motorized unidirectional drive meansapplied to the crossshaft intermediate said auxiliary pedestals andserving t rotate the axles in opposite directions when said clutchmechanisms are successively brought into operative engagement.

LOUIS ILLMER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNTED STATES PATENTS Number Name Date 2,105,612 Pallas Jan. 18, 19381,539,795 Hutchins May 26, 1925 2,284,904 Illmer et al June 2, 1942i2,320,142 Illmer et al. May 25, 1943 2,105,637 Davis Jan. 18, 19381,002,435 Oswald Sept. 5, 1911 2,254,348 Bennewitz Sept. 2, 1941 650,887Wilkerson June 5, 1900 2,257,743 Greer Oct. 7, 1941 1,763,945 BedfordJune 17, 1930 1,265,418 Baldwin May 7, 1918

